hadoop-hdfs-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5889) When rolling upgrade is in progress, standby NN should create checkpoint for downgrade.
Date Tue, 11 Feb 2014 16:37:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5889?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13897992#comment-13897992
] 

Tsz Wo (Nicholas), SZE commented on HDFS-5889:
----------------------------------------------

Thanks.  It actually cannot send NameNodeFile.IMAGE_UPGRADE file since it can only send NameNodeFile.IMAGE
files.  Will also change it to support IMAGE_UPGRADE.

> When rolling upgrade is in progress, standby NN should create checkpoint for downgrade.
> ---------------------------------------------------------------------------------------
>
>                 Key: HDFS-5889
>                 URL: https://issues.apache.org/jira/browse/HDFS-5889
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>         Attachments: h5889_20140211.patch
>
>
> After rolling upgrade is started and checkpoint is disabled, the edit log may grow to
a huge size.  It is not a problem if rolling upgrade is finalized normally since NN keeps
the current state in memory and it writes a new checkpoint during finalize.  However, it is
a problem if admin decides to downgrade.  It could take a long time to apply edit log.  Rollback
does not have such problem.



--
This message was sent by Atlassian JIRA
(v6.1.5#6160)

Mime
View raw message